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## Homework Statement

Two point sources, S1 and S2, are vibrating in phase and produce waves with a wavelength of 2.5 m. The two waves overlap at a nodal point. Calculate the smallest corresponding difference in path length for this point.

## Homework Equations

## The Attempt at a Solution

I really don't know how to start this question. How can I find the length when I am only given the wavelength